// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/renderer_host/pepper/pepper_print_settings_manager.h"

#include "content/public/browser/browser_thread.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/common/content_client.h"
#include "ppapi/c/pp_errors.h"
#include "printing/features/features.h"

#if BUILDFLAG(ENABLE_PRINT_PREVIEW)
#include "printing/printing_context.h" // nogncheck
#include "printing/units.h" // nogncheck
#endif

namespace content {

namespace {

#if BUILDFLAG(ENABLE_PRINT_PREVIEW)
    // Print units conversion functions.
    int32_t DeviceUnitsInPoints(int32_t device_units,
        int32_t device_units_per_inch)
    {
        return printing::ConvertUnit(
            device_units, device_units_per_inch, printing::kPointsPerInch);
    }

    PP_Size PrintSizeToPPPrintSize(const gfx::Size& print_size,
        int32_t device_units_per_inch)
    {
        PP_Size result;
        result.width = DeviceUnitsInPoints(print_size.width(), device_units_per_inch);
        result.height = DeviceUnitsInPoints(print_size.height(), device_units_per_inch);
        return result;
    }

    PP_Rect PrintAreaToPPPrintArea(const gfx::Rect& print_area,
        int32_t device_units_per_inch)
    {
        PP_Rect result;
        result.point.x = DeviceUnitsInPoints(print_area.origin().x(), device_units_per_inch);
        result.point.y = DeviceUnitsInPoints(print_area.origin().y(), device_units_per_inch);
        result.size = PrintSizeToPPPrintSize(print_area.size(), device_units_per_inch);
        return result;
    }

    class PrintingContextDelegate : public printing::PrintingContext::Delegate {
    public:
        // PrintingContext::Delegate methods.
        gfx::NativeView GetParentView() override { return NULL; }
        std::string GetAppLocale() override
        {
            return GetContentClient()->browser()->GetApplicationLocale();
        }
    };

    PepperPrintSettingsManager::Result ComputeDefaultPrintSettings()
    {
        // This function should run on the UI thread because |PrintingContext| methods
        // call into platform APIs.
        DCHECK_CURRENTLY_ON(BrowserThread::UI);

        PrintingContextDelegate delegate;
        std::unique_ptr<printing::PrintingContext> context(
            printing::PrintingContext::Create(&delegate));
        if (!context.get() || context->UseDefaultSettings() != printing::PrintingContext::OK) {
            return PepperPrintSettingsManager::Result(PP_PrintSettings_Dev(),
                PP_ERROR_FAILED);
        }
        const printing::PrintSettings& print_settings = context->settings();
        const printing::PageSetup& page_setup = print_settings.page_setup_device_units();
        int device_units_per_inch = print_settings.device_units_per_inch();
        if (device_units_per_inch <= 0) {
            return PepperPrintSettingsManager::Result(PP_PrintSettings_Dev(),
                PP_ERROR_FAILED);
        }
        PP_PrintSettings_Dev settings;
        settings.printable_area = PrintAreaToPPPrintArea(page_setup.printable_area(),
            device_units_per_inch);
        settings.content_area = PrintAreaToPPPrintArea(page_setup.content_area(), device_units_per_inch);
        settings.paper_size = PrintSizeToPPPrintSize(page_setup.physical_size(), device_units_per_inch);
        settings.dpi = print_settings.dpi();

        // The remainder of the attributes are hard-coded to the defaults as set
        // elsewhere.
        settings.orientation = PP_PRINTORIENTATION_NORMAL;
        settings.grayscale = PP_FALSE;
        settings.print_scaling_option = PP_PRINTSCALINGOPTION_SOURCE_SIZE;

        // TODO(raymes): Should be computed in the same way as
        // |PluginInstance::GetPreferredPrintOutputFormat|.
        // |PP_PRINTOUTPUTFORMAT_PDF| is currently the only supported format though,
        // so just make it the default.
        settings.format = PP_PRINTOUTPUTFORMAT_PDF;
        return PepperPrintSettingsManager::Result(settings, PP_OK);
    }
#else
    PepperPrintSettingsManager::Result ComputeDefaultPrintSettings()
    {
        return PepperPrintSettingsManager::Result(PP_PrintSettings_Dev(),
            PP_ERROR_NOTSUPPORTED);
    }
#endif

} // namespace

void PepperPrintSettingsManagerImpl::GetDefaultPrintSettings(
    PepperPrintSettingsManager::Callback callback)
{
    BrowserThread::PostTaskAndReplyWithResult(
        BrowserThread::UI,
        FROM_HERE,
        base::Bind(ComputeDefaultPrintSettings),
        callback);
}

} // namespace content
